Machine for driving metallic fastenings.



Patented May 29, I900.

, J. nALPE. MACHINE FOR DRIVING METALLIQ FASTENINGS.

(Application filed June 15, 1898.)

(No Model.)

UNITED STATES PATENT'Y OFFICE.

JACOB DALPE, OF NATIOK, MASSACHUSETTS.

MACHINE FOR DRIVING METALLIC FASTEVNINGS.

SPECIFICATION forming part of Letters Patent No. 650,600, dated May 29, 1900. Application filed June 15, 1898. Serial No. 683,463. (No model.)

To aZZ whmn it may concern:

Be it known that I, J ACOB DALPE, of Natick, county of Middlesex, State of Massachusetts; have invented an Improvement in Machines for Driving Metallic Fastenin gs, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to machines for driving metallic fastenings, and the invention as herein embodied is illustrated in connection with a hand-tacker, but it will be understood that my invention is applicable to power-operated machinery.

In myinvention headed fastenings supplied automatically from any usual raceway come upon a yielding or spring-supported circularly-movable rest, the head of the fastening as it comes on said rest arriving in the path of movement of a driver carried by a driver-bar. The driver is shown as having a secant face at that side next to the fastening immediately behind the fastening about to be driven, and the fastening next the one to be driven is shielded from the action of the driver by a yielding shield, herein shown as 'near the deliveryend of the raceway.

acted upon by the driver just before it strikes the upper end of the fastening, said shield as it is moved toward the end of the raceway acting against the head of the fastening lying at the extremity of the raceway next back of the fastening on the rest and next to be driven, said shield passing below the upper end ofsaid fastening and blocking its way, so that it cannot escape from the raceway while the driver is acting to drive the fastening then lying on the rest, said shield also acting to depress the yielding lower end of the raceway-cover onto the fastenings lying on or The driver meets the upper end of the fastening lying on the rest and drives it toward the work on which the nose of the apparatus bears, and during this driving operation the spring which normally sustains the rest yields and lets the fastening descend at a speed determined by the speed of movement of the driverbar, and the nose remains in its depressed position while the drivercompletes the driving of a fastening and rises, and as the lower end of the driver passes above the lower end of the raceway the rest immediately resumes its normal position, ready to receive on it the fastening then at the end of the raceway, the fastening which the shield acted upon to keep it on the raceway during the driving opera tionj ust described. The rest is herein shown as a circular block or device having a circum ferential groove in which is entered the driver when in operation, and said groove may aid to steady the driver and prevent it from being deflected laterally. The block referred to is slotted transversely to'provide a shoulder, it constituting the main or efiective part of the rest for the under side of the head of the fastening, the block being further shown as provided with a broader transverse slot which cooperates with a stop of some kind connected with the framework to determine the length of stroke of the rest under the action of the descending driver. Figure 1, in elevation, represents an apparatus containing my improvements. Fig. 2 is a section of Fig. 1 in the line m looking toward the right. Fig. 3 is a plan view and section of Fig. 1, the section being in the line at, the lid or cover of the fastening-receptacle being shown as open. Fig. 4 shows the rest in perspective and detached. Fig. 5 is a side elevation of the rest partially broken out to show its groove. the rest, showing a fastening supported upon the shoulder thereof and a driver as acting upon the head of the fastening. Fig. 7 is an enlarged cross-section of the driver. Fig. 8 shows the shield and part of the end of the raceway, the shield occupying its closed position. Y

The case or framework a is provided at its lower end with a suitable nose a to rest on the work and to guide the fastenings while being driven. This case receives in it a driver-bar b, normallykept in its elevated position by a suitable spring I), said driverbar having connected to it a driver I)". This driver resembles other drivers commonly used in nailing-machines, with the exception that one side of it-viz., the side next the end of the raceway-is.cut away (see Fig. 7) to leave a secant-face.

Fig. 6 is a section of The raceway c is composed of two plates between them in a single row to theend of the raceway, where the under sides of the heads of the fasteuings are supported on a nearly horizontally arranged lip, all as in usual manner, and this raceway has cooperating with it a yielding or spring-like cover a, the under side of said cover being slightly elevated above the top of the raceway to enable the heads of the fastenings to. pass under it on their way down into driving position. I have connected with this racewavbyh screws 0 a fastening-receiver a it having a cover 0 and having usual ears 0 to receive the said screws. The fastenin gs coming into this receiver a will, as the raceway is shaken, enter the groove 0 of the raceway, the raceway having usual shelves 0 to aid the fastenings in tumbling into the slot of the raceway.

The case a is cut away at one side, as herein represented, and it has a circular opening in which is placed a rest d, said rest being herein represented as a circular block having an annular groove d extended for a greater .or less distance about it, said groove being intersected by a cross-groove d to leave shoulders d which constitute the main or effective part of the rest to sustain the lower side of the head of a fastening f, as represented in Fig. 6. This rest has, as herein shown, a projection d to which is connected one end of a'suitable spiral or other spring 02 the opposite end of said spring being fixed by a suitable stud or screw 01, inserted, as herein represented, in part of the raceway. The rest has asecond cross groove or notch 61 in which is extended one end of a stop d represented in Fig. 1 as a screw. In Fig. 1 it will be noticed that one of the shouldersleft by the formation of the cross-groove d rests against the said stop, and it is maintained normally in that position by the spring (1 but said rest' may turn in a circular path, the said springat such time yielding whenever the driver meets the head of a fastening supported on the shoulder d of the rest, and during such operation the driver enters the groove cl, so that it accurately meets the head of the fastening, and by reason of said groove the driver is prevented from springing laterally out of proper operating position. I have shown a small ear 6 attached by a screw e, enteringa part of the casing, and the opposite end of said car has a pin or stud 2 on which is mounted a shield 6 This shield normallystands with its free end in the groove (1. ofthe rest at a point just above the shouldercP-when the said rest is in its normal position, as seen in Fig. 1. When the driver descends to drive a nail sustained by its head on the shoulder 61 of the rest, the said driver firstmeets the shield and depresses it in the position shown in Fig. 8, causing said shield to meet the fastening next behind the one to be driven and supported at the extremity of the raceway, said shield passing below the upper end of said fastening and also acting preferably to somewhat depress the cover of the raceway upon that fastening and that im mediately behind it, so that said shield at such time incloses the end of the raceway and forms a separation between the fastening then to be driven and the fastening behind it on the raceway. Owing to the shape of the driver it may readily pass the shield, and the lower end of the driver acts on nearly the entire portion'of the upper end of the fastening, the contact of the driver and upper end of the fastening being sufficient to insure its being driven correctly into the work. As the driver descends and contacts with the head of the fastening the rest yields, and, finally, after a certain distance of movement in the arc of a circle the under side of the head of the fastening slips off from the shoulder, and the quick-moving driver follows the fastening and drives it through the preliminary guide g and also through the nose a into the work. As the driver rises under the action of its spring into its normal position the rest immediately follows it under the action of its spring d and the shield rises, immediately releasing the endmost fastening on the'raceway, so

that it escapes therefrom onto the rest ready to be driven when the driver is again dopressed.

The circularly-movable rest is herein rep resented as being partially rotated solely by or through the action of the driver against the head of the fastening; but this'invention would not be departed from if the rest were turned in unison with the movement of the driver by any usual or suitable devices deriving their movement from the 'dr iver-bar or driver. A

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is- Y 1. In a machine for driving m'etallic'fastem ings, a raceway, a yielding rest, havinga peripheral groove, said rest being mounted on a stationary pivot concentric with said pe= ripheral-groove, a cross-groove intersecting said peripheral groove providing normallyhorizontal shoulders to receive the head of a fastening from said raceway, a driver, and a driver-bar, substantially as described 2. In a machine of the class described, a yielding rest in the form of a circular block, peripherally grooved and centrally pivoted, and having a shoulder at one side to receive a fastening to be driven, and a notch at'the opposite side to cooperate with a stop to limit the movement of the block, combined with a raceway, a driver, a driver-bar, and a stop, substantially as described.

8. In a machine of the class described, a yielding rest in the form of a circular block centrally pivoted, said block having a shoulder normally horizontal to'support the under side of, a fastening to be driven and'formed'by a recess cut into the peripheryof said block, said block above said shoulder having a deep peripheral-groove, combined with a raceway for the fastenings, a driver, and means to operate it, said driver operating perpendicularly to the normal position of said horizontal shoulder, and being at all times in its movement embraced and guided by the flanges of said peripheral groove, substantially as described.

4. In a machine of the class described, a raceway to receive and guide fastenings, a driver for driving the fastenings one by one as they are delivered from said raceway, and a shield above said raceway and normally projecting in the path of said driver, the end of said shield extending out over and having a shape to inclose the end of the raceway and being depressed by the descending driver into inelosing engagement over the end of the raceway, substantially as described.

5. In a machine of the class described a raceway, a pivoted rest having a shoulder to receive the endmost fastening from said raceway and having a peripheral groove, a driverbar provided with a driver adapted to be guided by and between the walls of said groove and a spring-arm constituting a shield and located to engage the head of the fastening next the one to be driven and disposed in said groove and in the path of said driver.

6. In a machine of the class described, a raceway to receive and guide fastenings, said raceway having a yielding cover extending down to its delivery end, a driver for driving the fastenings one by one as they are delivered from said raceway, and a shield above the cover of said raceway and normally projecting in the path of said driver,'the end of said shield extending out over the end of the raceway and being depressed by the descending driver into inclosing engagement over the end of the raceway, said depressed shield engaging and pressing said cover against the fastenings in the raceway, substantially as described.

7. In a machine of the class described, a yielding rest in the form of a circular block centrally pivoted, said block having a shoulder normally horizontal to support the under side of a fastening to be driven and formed by a recess cut into the periphery of said block, said block above said shoulder'having a deep peripheral groove, combined with a raceway for the fastenings, a driver, and means to operate it, said driver operating perpendicularly to the normal position of said horizontal shoulder, and being embraced and guided by the flanges of said peripheral groove, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JACOB DALPE.

Vitnesses:

GEo. W. GREGORY, MARGARET A. DUNN. 

